Natural Australian boulder opal from Yowah area, cut and polished to show it's natural beauty, still partially in ironstone host rock. 925 silver bail. Dimensions: 25x15x5 mm without a bail. It has flashes of purple, blue, green, orange and red colors. Has a good brightness, probably around 4 out of 5. Play of color depends on lights condition, pictures are made indoors with artificial light. Australian opal is a sedimentary variety which is stable, is not affected by contract with any liquids and can last very long time if is used with care. Opal itself is relatively soft stone, but ironstone host rock gives it extra strength and protection. Still try to not weird it to gym or when doing hard labor - to prevent scratches.